THE PHYSIOLOGY 

 OF REPRODUCTION 



BY 



FRANCIS H. A. MARSHALL 



SC.D. (CAMB.), D.SC. (EDIN.), F.R.S. 



FELLOW OF CHRIST'S COLLEGE, AND READER IN AGRICULTURAL PHYSIOLOGY 

 IN THE UNIVERSITY OF CAMBRIDGF. 



WITH CONTRIBUTIONS BY 



WILLIAM CRAMER, PH.D., D.Sc., M.R.C.S., L.R.C.P. 

 JAMES LOCHHEAD, O.B.E., M.A., M.D., F.R.C.S.E. 



AND 



CRESSWELL SHEARER, M.D., Sc.D., F.R.S. 



SECOND AND REVISED EDITION 



LONGMANS, GREEN, AND CO. 



39 PATERNOSTER ROW, LONDON, E.C-4 



NEW YORK, TORONTO 

 BOMBAY, CALCUTTA. AND MADRAS 



1922 

 All rights reserved 



